CN101383804B - Digital television ground broadcast transmitter modulation method having time-domain training sequence and BICM - Google Patents
Digital television ground broadcast transmitter modulation method having time-domain training sequence and BICM Download PDFInfo
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Abstract
The invention discloses a modulation method of a digital television terrestrial broadcast transmitter with a time domain training sequence and BICM. The modulation method comprises the following steps: (1) an input bit stream carries out multi-rate punctured convolutional coding, bit interleaving and code element modulation to further form an FFT data block on a frequency domain; (2) the FFT data block is converted into a time domain discrete data sample block by IFFT; (3) a cyclic prefix is inserted into the time domain discrete data sample block as a guard interval so as to form a time domain cyclic prefix discrete data sample block; (4) four continuous time domain cyclic prefix discrete data sample blocks form a frame body; (5) the training sequence is used as a real part sequence of a complex training sequence and a service index sequence is used as an imaginary-part sequence of the complex training sequence so as to form a discrete sample block of the time domain complex training sequence; (6) the discrete sample block of the time domain complex training sequence is inserted into the frame body to form a signal frame; (7) a square root raised consine roll-off filter is used to carry out pulse shaping to the signal frame; and (8) a baseband signal is carried out up-variation frequency to a carrier wave.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of (Bit Interleave coded modulation, Bit Interleaved Coded Modulation, BICM) digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM.
Background technology
At present, ground TV broadcast develops to the digitlization direction gradually from simulation.Digital television ground broadcast transmission system, as the important component part of Digital Television Terrestrial Broadcasting, its development of technologies, closely bound up with people's quality of life, and therefore be subjected to people's extensive concern especially.Digital Television Terrestrial Broadcasting correlation technique and related industry thereof are that development is very fast in the Communications And Computer field, the industry of good market prospect.On the Digital Television Terrestrial Broadcasting correlation technique, the emphasis of various countries' concern at present is that the Digital Television Terrestrial Broadcasting how to pass under the environment for complex wave provides the implementation of reliable high-speed mobile cheaply.The digital television ground broadcast transmitter modulation technique is the key technology of digital tv ground broadcasting, for whole system performance decisive role, is the object of everybody primary study.
Because the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes becoming more and more easier.Because of OFDM multi-carrier transmission technology has simple in structure, the availability of frequency spectrum high plurality of advantages such as becomes and extremely everybody concern and obtain deep research and the extensive use in numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, Digital Television Terrestrial Broadcasting in the time of can resisting frequency selectivity and channel.
Chnnel coding is the important component part of digital communication system.Along with the develop rapidly of modern information technologies, channel coding technology has become the indispensable technology in modern communications field.Embed redundancy symbol in information sequence, the effect of channel coding technology by redundancy symbol reduces signal and makes a mistake in transmission course, thereby improves the reliability of communication system.
Under multidiameter fading channel, can be by coding, interweave and the optimal design of modulation scheme reaches big as far as possible signal diversifying exponent number, so that in equaling or exceeding the symbol sebolic addressing of minimum free distance, obtain independent decline.BICM technology (Bit Interleave coded modulation, Bit Interleaved Coded Modulation, BICM) adopt bit interleaver and feasible coding and modulated process relatively independent, thereby make and to expand diversity order to different binary bits number from different multi-system symbolic numbers, that is to say that its diversity order L is the smallest hamming distance between the binary code word sequence.Because the BICM technology makes diversity order be improved significantly, therefore, make communication system under multidiameter fading channel, have good bit error performance.
In the practical communication environment, the Digital Television Terrestrial Broadcasting communication system performance is subjected to the influence of factors such as lock in time, clock jitter, channel fading, channel disturbance.Transmitter modulation method is the key technology that realizes the reliable digit television terrestrial broadcasting.
Utilizing digital television ground broadcast transmission system that may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service are provided is embodiments that digital television ground broadcast transmission system of new generation satisfies social needs.
Just be based on above background, the present invention is directed to the practical communication environment and propose a kind of digital television ground broadcast transmitter modulation method, can satisfy the needs of High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission with time-domain training sequence and BICM.
Desire is done more deep understanding to the patent background can be with reference to following documents and materials:
L.J.Cimini，“Analysis?and?simulation?of?a?digital?mobilechannel?using?orthogonal?frequency?division?multiplexing，”IEEETrans.Commun.，vol.COM-33，pp.665-675，July?1985.
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimediacommunications”.Boston：Artech?House，2000.
A.R.S.Bahai?and?B.R.Saltzberg.“Multi-Carrier?DigitalCommunications：Theory?and?Applications?of?OFDM”.KluwerAcademic/Plenum，1999.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overviewof?digital?television?development.”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?andEmerging?Services，pp.8-21，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?codedmodulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
X.Li，A.Chindapol?and?J.A.Ritchey，“Bit-interleaved?codedmodulation?with?iterative?decoding?and?8?PSK?signaling.”IEEETrans.Commun.，vol.50，pp.1250-1257，2002.
J.Hagenauer，“Rate-compatible?punctured?convolutional?codesand?their?applications，”IEEE?Trans.Commun.，vol.36，no.4，pp.389-400，April?1988.
X.Li?and?J.A.Ritcey，“Bit-interleaved?coded?modulation?withiterative?decoding，”IEEE?Commun.Lett.，vol.1，pp.169-171，Nov.1997.
A.Chindapol?and?J.A.Ritcey，“Design，analysis，andperformance?evaluation?for?BICM-ID?with?square?QAMconstellations?in?Rayleigh?fading?channels，”IEEE?J.Select.Areas?Commun.，vol.19，no.5，pp.944-957，May?2001.
U.Wachsmann，R.Fischer，and?J.Huber，“Multilevel?codes：theoretical?concepts?and?practical?design?rules，”IEEE?Trans.Inform.Theory，vol.45，no.5，pp.1361-1391，July?1999.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serialconcatenation?of?interleaved?codes：performance?analysis，design，and?iterative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
Summary of the invention
The present invention is directed to High Data Rate may command multi-service Digital Television Terrestrial Broadcasting and proposed a kind of digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM.
A kind of digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM that the present invention proposes, BICM represents the Bit Interleave coded modulation, it is characterized in that it comprises the following steps:
1) digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is that symbol numbers is K;
2) digital television ground broadcast transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain, and IFFT represents the fast discrete Fourier inverse transformation;
3) digital television ground broadcast transmitter is inserted into Cyclic Prefix as protection the discrete bits interweaving encoding modulating data sample value piece of time domain at interval, form time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece, the length of Cyclic Prefix is C, and the length of time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece is K+C;
4) digital television ground broadcast transmitter forms frame with 4 continuous time domain cyclic prefix discrete bits interweaving encoding modulating data sample value pieces, and the length of frame is L, L=4 * (K+C);
5) digital television ground broadcast transmitter with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitute the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X;
6) digital television ground broadcast transmitter is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head, to form signal frame;
7) digital television ground broadcast transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
8) digital television ground broadcast transmitter with the baseband signal up-conversion to carrier wave.
The digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM according to above-mentioned is characterized in that: have time domain sequence of plural training discrete sample block in the signal frame of digital television ground broadcast transmitter; The length of the training sequence of digital television ground broadcast transmitter is that symbol numbers X is 512, the length of corresponding FFT Bit Interleave coding modulation data piece is that symbol numbers K also is that sub-carrier number is 1024, the frequency interval of corresponding subcarrier is respectively 8KHz, and corresponding circulating prefix-length C is 1/16 of a FFT Bit Interleave coding modulation data block length K size; The training sequence of digital television ground broadcast transmitter, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics; The training sequence of digital television ground broadcast transmitter, operational indicator sequence have orthogonality each other; The different operational indicator sequence of each of digital television ground broadcast transmitter is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter; The input data are carried out multi code Rate of Chinese character, and to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one; Bit Interleave adopts the random interleaving mode; Code element is modulated to a kind of among QPSK, 16QAM, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
Characteristics of the present invention:
The present invention is the modulation scheme that a kind of time-domain and frequency-domain mixes.Has time domain sequence of plural training discrete sample block in the signal frame of digital television ground broadcast transmitter, the training sequence of digital television ground broadcast transmitter, the operational indicator sequence has pseudo-random characteristics, the training sequence of digital television ground broadcast transmitter, the operational indicator sequence has orthogonality each other, digital television ground broadcast transmitter is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head and forms signal frame, and these have guaranteed that digital television ground broadcast transmitter can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic reliably followed the tracks of.The discrete bits interweaving encoding modulating data sample value piece that Cyclic Prefix is inserted at interval time domain as protection can reduce time domain sequence of plural training discrete sample block, adjacent time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece interference effect each other to form time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece.4 continuous time domain cyclic prefix discrete bits interweaving encoding modulating data sample value pieces are formed the efficient that frame can improve digital tv ground broadcasting.Adopt BICM that the input data are carried out the Bit Interleave coded modulation and improved diversity order, make communication system under multidiameter fading channel, have good bit error performance.The different operational indicator sequence of each of digital television ground broadcast transmitter is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter, digital television ground broadcast transmission system can satisfy social needs so that can provide may command multi-services such as free television broadcasting, paid television broadcasting, security information transmission, multimedia value-added service.Modulator approach of the present invention have lock in time short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide plurality of advantages such as High Data Rate may command multi-service Digital Television Terrestrial Broadcasting transmission.
Description of drawings
Fig. 1 is the embodiment schematic diagram according to certain transmitter of the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of the present invention.
Fig. 2 is the embodiment schematic diagram that forms signal frame according to certain transmitter with digital television ground broadcast transmitter modulation method of time-domain training sequence and BICM of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail.
The embodiment of certain transmitter of the digital television ground broadcast transmitter modulation method that proposes according to the present invention with time-domain training sequence and BICM, BICM represents the Bit Interleave coded modulation, as shown in Figure 1, follows these steps to carry out:
1) digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation on frequency domain, FFT represents the fast discrete Fourier conversion, the length of FFT Bit Interleave coding modulation data piece is that symbol numbers is K, K gets 1024, and the frequency interval of corresponding subcarrier is got 8KHz;
2) digital television ground broadcast transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain, and IFFT represents the fast discrete Fourier inverse transformation;
3) digital television ground broadcast transmitter is inserted into Cyclic Prefix as protection the discrete bits interweaving encoding modulating data sample value piece of time domain at interval, form time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece, the length of Cyclic Prefix is C, the length of time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece is K+C, and C gets 1/16 of FFT Bit Interleave coding modulation data block length K size;
4) digital television ground broadcast transmitter forms frame with 4 continuous time domain cyclic prefix discrete bits interweaving encoding modulating data sample value pieces, and the length of frame is L, L=4 * (K+C);
5) digital television ground broadcast transmitter with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is X all, and X gets 512;
6) digital television ground broadcast transmitter is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head, to form signal frame;
7) digital television ground broadcast transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
8) digital television ground broadcast transmitter with the baseband signal up-conversion to carrier wave.
Form the embodiment of signal frame according to certain transmitter of the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of the present invention, as shown in Figure 2, specifically implement as follows:
This certain digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation on frequency domain, through IFFT it is transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain again.
FFT Bit Interleave coding modulation data piece is made up of subcarrier.The length of FFT Bit Interleave coding modulation data piece is that symbol numbers is K; The length K of FFT Bit Interleave coding modulation data piece is that sub-carrier number gets 1024, and the frequency interval of corresponding subcarrier is got 8KHz.
This certain digital television ground broadcast transmitter is inserted into Cyclic Prefix as protection the discrete bits interweaving encoding modulating data sample value piece of time domain at interval; form time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece; the length of Cyclic Prefix is C; the length of time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece is K+C, and C gets 1/16 of FFT Bit Interleave coding modulation data block length K size.
This certain digital television ground broadcast transmitter forms frame with 4 continuous time domain cyclic prefix discrete bits interweaving encoding modulating data sample value pieces, and the length of frame is L, L=4 * (K+C).
This certain digital television ground broadcast transmitter as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitutes the discrete sample block of sequence of plural training with training sequence on time domain.
The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is X all, and X gets 512.
Training sequence, operational indicator sequence as digital television ground broadcast transmitter are formed by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that satisfies above-mentioned feature can be by realizing as one group of displacement m sequence of a kind of specific type of pseudo-random number sequence with as the walsh sequence of orthogonal sequence, Hadamard sequences or by the orthogonal sequence that other modes produce.
Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing digital television ground broadcast transmitter.
This certain digital television ground broadcast transmitter is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head, to form signal frame.
This certain digital television ground broadcast transmitter adopts square root raised cosine filter that the signal of signal frame is carried out pulse shaping.The signal of signal frame is carried out the rolloff-factor of the square root raised cosine filter of pulse shaping and get 0.05.
In conjunction with the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to the foregoing description, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (8)
1. digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM, BICM represents the Bit Interleave coded modulation, it is characterized in that it comprises the following steps:
1) digital television ground broadcast transmitter is flowed through the input data bit of oneself and is further formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation on frequency domain, FFT represents the fast discrete Fourier conversion, and the length of FFT Bit Interleave coding modulation data piece is that symbol numbers is K;
2) digital television ground broadcast transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to the discrete bits interweaving encoding modulating data sample value piece of time domain, and IFFT represents the fast discrete Fourier inverse transformation;
3) digital television ground broadcast transmitter is inserted into Cyclic Prefix as protection the discrete bits interweaving encoding modulating data sample value piece of time domain at interval, form time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece, the length of Cyclic Prefix is C, and the length of time domain cyclic prefix discrete bits interweaving encoding modulating data sample value piece is K+C;
4) digital television ground broadcast transmitter forms frame with 4 continuous time domain cyclic prefix discrete bits interweaving encoding modulating data sample value pieces, and the length of frame is L, L=4 * (K+C);
5) digital television ground broadcast transmitter with training sequence as the real part sequence of sequence of plural training, with the imaginary part sequence of operational indicator sequence as sequence of plural training, constitute the discrete sample block of sequence of plural training on time domain, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X;
6) digital television ground broadcast transmitter is inserted into frame with the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head, to form signal frame;
7) digital television ground broadcast transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;
8) digital television ground broadcast transmitter with the baseband signal up-conversion to carrier wave.
2. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 1, it is characterized in that: the length of the discrete sample block of the training sequence of described digital television ground broadcast transmitter, operational indicator sequence, sequence of plural training is that symbol numbers X is 512.
3. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 2, it is characterized in that: described training sequence, operational indicator sequence have pseudo-random characteristics.
4. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is made up of subcarrier, the length of FFT Bit Interleave coding modulation data piece is that symbol numbers K also is that sub-carrier number is 1024, and the frequency interval of subcarrier is 8KHz.
6. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 1, it is characterized in that: describedly the input data are carried out multi code Rate of Chinese character delete the multi code Rate of Chinese character of surplus convolutional encoding, Bit Interleave, code element modulation treatment to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one, Bit Interleave adopts the random interleaving mode, code element is modulated to a kind of among QPSK, 16QAM, 32QAM and the 64QAM, and symbol constellations figure mapping mode adopts the Gray code mapping.
7. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 1; it is characterized in that: described length as the Cyclic Prefix of protecting the discrete bits interweaving encoding modulating data sample value piece that is inserted into time domain at interval is C, and C gets 1/16 of K size.
8. by the digital television ground broadcast transmitter modulation method with time-domain training sequence and BICM of claim 1, it is characterized in that: described signal frame is inserted into 4 continuous time domain cyclic prefix discrete bits interweaving encoding modulating data sample value pieces by the discrete sample block of the sequence of plural training that constitutes on the time domain as frame head and forms as frame.
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| CN101778079B (en) * | 2010-03-03 | 2011-06-29 | 宁波大学 | Multimedia broadcast wireless signal anti-jamming transmission method |
| CN102281231B (en) * | 2011-08-22 | 2013-08-21 | 宁波大学 | Multimedia broadcast mobile signal anti-interference framing modulation method |
| CN102271116A (en) * | 2011-08-22 | 2011-12-07 | 宁波大学 | Anti-fading multimedia wireless broadcast signal framing modulation method |
| CN102281237B (en) * | 2011-08-22 | 2013-07-24 | 宁波大学 | Mobile multimedia broadcast signal framing modulation method |
| KR102454643B1 (en) * | 2015-03-06 | 2022-10-17 | 한국전자통신연구원 | Apparatus for generating broadcasting signal frame using bootstrap and preamble, and method using the same |
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| CN1317903A (en) * | 2001-04-27 | 2001-10-17 | 清华大学 | Time domain synchronized orthogonal frequency-division complex modulation method |
| CN1980210A (en) * | 2005-12-08 | 2007-06-13 | 北京邮电大学 | Method for realizing sign blind synchronization in zero-prefix orthogonal frequency-division multiplexing system |
| CN101141168A (en) * | 2007-10-18 | 2008-03-12 | 郑紫微 | Orthogonal time-domain training sequence based multi-user MIMO-OFDM modulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1317903A (en) * | 2001-04-27 | 2001-10-17 | 清华大学 | Time domain synchronized orthogonal frequency-division complex modulation method |
| CN1980210A (en) * | 2005-12-08 | 2007-06-13 | 北京邮电大学 | Method for realizing sign blind synchronization in zero-prefix orthogonal frequency-division multiplexing system |
| CN101141168A (en) * | 2007-10-18 | 2008-03-12 | 郑紫微 | Orthogonal time-domain training sequence based multi-user MIMO-OFDM modulation method |
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